javascript - "arrow function expected no return value"带有清理功能的useEffect

Question

这是我的useEffect带有简单的清理功能() => { inbox?.destroy(); } ，但是当我在那里使用清理功能时会发出警告。为什么，清理功能不是合法的语法吗？如何修复它(当然不删除清理功能)？

  useEffect(() => {
    const { currentUser } = initialState!;
    let inbox: Talk.Inbox;
    if (!currentUser || !talkjsContainerRef.current) return;

    Talk.ready.then(async () => {
      const me = employeeToUser(currentUser);
      window.talkSession = new Talk.Session({ appId, me });
      if (id === undefined) {
        // me without other => most recent message first
        inbox = window.talkSession.createInbox();
      } else {
        // me with an other => select other
        const other = employeeToUser(await readEmployee(Number(id)));
        const conversation = window.talkSession.getOrCreateConversation(Talk.oneOnOneId(me, other));
        conversation.setParticipant(me);
        conversation.setParticipant(other);
        inbox = window.talkSession.createInbox({ selected: conversation });
      }
      inbox.mount(talkjsContainerRef.current);
    });

    return () => {
      inbox?.destroy();
    };
  }, [id, initialState]);

Answer 1

一个可能的修复:转return;至return undefined;
解释:
我违反了 consistent-return rule

This rule requires return statements to either always or never specify values

在第 4 行， if (!currentUser || !talkjsContainerRef.current) return; , 我的 return声明 未指定值 ，即 与我的“清理功能”相矛盾 .